† The World Health Organization provides a single recommended daily intake for the combinations of Methionine and Cysteine and the combination of Phenylalanine and Tyrosine.

‡ Arginine, Cystine and Tyrosine are required by infants and growing children and we have therefore included them in the list of essential amino acids. [Imura K, Okada A (1998). "Amino acid metabolism in pediatric patients"]

† The World Health Organization provides a single recommended daily intake for the combinations of Methionine and Cysteine and the combination of Phenylalanine and Tyrosine.

‡ Arginine, Cystine and Tyrosine are required by infants and growing children and we have therefore included them in the list of essential amino acids. [Imura K, Okada A (1998). "Amino acid metabolism in pediatric patients"]